Automobile back door double-color mask mold

Abstract

The utility model relates to the technical field of automobile part manufacturing molds, and discloses an automobile back door double-color mask mold which comprises a fixed mold and a movable mold, a forming cavity is formed in the left side of the inner wall of the fixed mold, a plurality of injection molding pipes are communicated with the right side of the inner wall of the forming cavity, and flow sensors are communicated with the right sides of the outer walls of the injection molding pipes on the upper side. The right sides of the multiple injection molding pipes communicate with external connecting pipes, a cooling pipeline is fixedly connected to the inner wall of the fixed mold, a sliding groove is formed in the right side of the outer wall of the movable mold, a sliding block is slidably connected to the inner wall of the sliding groove, and a plurality of inserting rods are slidably connected to the left side of the outer wall of the sliding block. According to the utility model, through the structural matching of the sliding block, the spring and the electromagnet, the accurate switching of injection molding areas is realized, the problem of inaccurate movement and positioning of the sliding block is solved, the problems of product deformation and infirm combination in the prior art are effectively improved, and the product quality is improved.

Description

Technical Field

[0001] This utility model relates to the field of automotive parts manufacturing mold technology, and in particular to a two-color mask mold for automotive tailgate. Background Technology

[0002] The tailgate of a car is the rear door of the vehicle. It is an important part of the car body and is located at the rear of the vehicle. It is mainly used to facilitate users to load and unload luggage and other items. With the development of the automotive industry, consumers have increasingly higher requirements for the personalization and aesthetics of car appearance. In order to meet this demand, car manufacturers have begun to use two-tone covers in the design of car tailgates to add a unique visual effect and sense of style to the vehicle.

[0003] Traditional automotive tailgate two-color face shield molds mainly consist of a mold base, molding components, a gating system, a cooling system, and a switching mechanism. The gating system struggles to precisely control the flow rate and pressure of the two colored plastics, leading to weld lines, flow marks, and other surface defects at the two-color joint, affecting product quality. To address these issues, existing technologies have improved two-color face shield molds by adding flow meters and pressure sensors. However, in actual use, the switching between the two color injection areas is achieved using a slider and rotation method. Because the slider's movement precision and rotational positioning accuracy are difficult to guarantee, inaccurate switching occurs, affecting the uniformity of heat transfer in the plastic. This results in temperature differences at the joint during cooling, generating internal stress and ultimately causing product deformation or weak bonding. Utility Model Content

[0004] To overcome the above shortcomings, this utility model provides a two-color mask mold for automotive tailgates, aiming to improve the problems in the prior art where it is difficult to guarantee the accuracy of slider movement and rotation positioning, and the switching is prone to inaccuracy, which affects the uniformity of heat transfer in plastics, causing temperature differences at the joint during cooling, generating internal stress, and leading to product deformation or weak bonding.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: a two-color mask mold for a car tailgate, comprising a fixed mold and a moving mold. A molding cavity is formed on the left side of the inner wall of the fixed mold. Multiple injection tubes are connected to the right side of the inner wall of the molding cavity. Flow sensors are connected to the right side of the outer walls of the multiple injection tubes on the upper side. External connecting pipes are connected to the right sides of the multiple injection tubes. Cooling pipes are fixedly connected to the inner wall of the fixed mold. A sliding groove is formed on the right side of the outer wall of the moving mold. A slider is slidably connected to the inner wall of the sliding groove. Multiple insert rods are slidably connected to the left side of the outer wall of the slider. Springs are provided on the outer walls of the multiple insert rods. The left ends of the multiple springs are fixedly connected to the moving mold. An electromagnet is fixedly connected to the left side of the inner wall of the sliding groove. A magnet is fixedly connected to the left side of the outer wall of the slider. Multiple positioning rods are fixedly connected to the right side of the outer wall of the moving mold. Multiple positioning holes are formed on the left side of the outer wall of the fixed mold. The multiple positioning rods are slidably connected to the corresponding positioning holes. An automatic demolding mechanism is provided on the right side of the outer wall of the fixed mold for automatic demolding.

[0006] As a further description of the above technical solution:

[0007] The automatic demolding mechanism includes multiple demolding rods, which are slidably connected to the upper and lower sides of the right end of the fixed mold. The right ends of the multiple demolding rods are fixedly connected to the same connecting plate. A fixing frame is fixedly connected to the right side of the outer wall of the fixed mold, and a push rod is fixedly connected to the left side of the outer wall of the fixing frame. The left end of the push rod is fixedly connected to the connecting plate.

[0008] As a further description of the above technical solution:

[0009] The top of both the fixed mold and the moving mold is fixedly connected to a mounting box, and an alarm light is fixedly connected to the inner wall of both mounting boxes.

[0010] As a further description of the above technical solution:

[0011] An information board is provided on the left side of the outer wall of the moving mold. Screws are threaded around the outer wall of the information board, and the rear ends of the outer walls of the screws are threaded to the moving mold.

[0012] As a further description of the above technical solution:

[0013] Each of the screws has a cross-shaped groove on the left side of its outer wall, and the inner wall of each cross-shaped groove is treated with an anti-slip coating.

[0014] As a further description of the above technical solution:

[0015] Two guide plates are fixedly connected to the rear side of the outer wall of the multiple fixed molds, and the moving mold is slidably connected to the guide plates.

[0016] As a further description of the above technical solution:

[0017] A controller is fixedly connected to the front side of the outer wall of the mold, and the controller is electrically connected to the flow sensor and the electromagnet respectively.

[0018] As a further description of the above technical solution:

[0019] The fixed mold and the moving mold are both fixedly connected to the front and rear sides of the bottom with fixed seats, and bolts are threaded to the four corners of the outer walls of the two fixed seats.

[0020] This utility model has the following beneficial effects:

[0021] 1. In this utility model, the precise matching of the positioning rods and positioning holes of the fixed mold and the moving mold greatly improves the positioning accuracy of mold closing, avoids a series of problems caused by inaccurate mold closing, ensures the accuracy of product molding, and the structural matching of the slider, spring and electromagnet realizes the precise switching of the injection area, solves the problem of inaccurate slider movement and positioning, effectively improves the problems of product deformation and weak bonding in the prior art, and improves product quality.

[0022] 2. In this utility model, the fixed mold provides a stable installation foundation for the demolding mechanism, ensuring the stability of the overall structure. Multiple demolding rods directly contact the product and perform demolding action under the action of power. The connecting plate connects the demolding rods into a whole to achieve synchronous movement, ensuring that the product is subjected to uniform demolding force, avoiding damage or deformation of the product due to uneven local force, and effectively maintaining the integrity of the product. Attached Figure Description

[0023] Figure 1 A perspective view of a two-color mask mold for a car tailgate proposed in this utility model;

[0024] Figure 2 This is a partial structural exploded view of a two-color mask mold for a car tailgate proposed in this utility model;

[0025] Figure 3 This is a schematic diagram of the cooling pipes of a two-color mask mold for a car tailgate proposed in this utility model;

[0026] Figure 4 This is a schematic diagram of an automatic demolding mechanism for a two-color mask mold for a car tailgate, as proposed in this utility model.

[0027] Figure 5 A schematic diagram of the electromagnet used in the mold for a two-color face mask for a car tailgate according to this utility model.

[0028] Figure 6 This is a schematic diagram of the magnet block for a two-color mask mold for a car tailgate, as proposed in this utility model.

[0029] Legend:

[0030] 1. Fixed mold; 2. Automatic demolding mechanism; 201. Demolding rod; 202. Connecting plate; 203. Fixing frame; 204. Push rod; 3. Moving mold; 4. Molding cavity; 5. Injection tube; 6. Flow sensor; 7. External connecting pipe; 8. Cooling pipe; 9. Sliding groove; 10. Slider; 11. Insert rod; 12. Spring; 13. Electromagnet; 14. Magnet block; 15. Positioning rod; 16. Positioning hole; 17. Mounting box; 18. Alarm light; 19. Information board; 20. Screw; 21. Cross groove; 22. Guide plate; 23. Controller; 24. Fixing base; 25. Bolt. Detailed Implementation

[0031] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0032] Reference Figure 2 , Figure 3 and Figure 5This utility model provides an embodiment of a two-tone automotive tailgate mold, comprising a fixed mold 1 and a moving mold 3. The fixed mold 1, as an important component of the mold, cooperates with the moving mold 3 to form a product molding space. A molding cavity 4 is formed on the left side of the inner wall of the fixed mold 1 to accommodate injection molding material and allow it to cool and solidify within it. Multiple injection tubes 5 are connected to the right side of the inner wall of the molding cavity 4 to introduce external plastic material into the molding cavity 4. Flow sensors 6 are connected to the right side of the outer walls of the multiple injection tubes 5 to monitor the flow rate of plastic within the injection tubes 5 in real time. External connecting pipes 7 are connected to the right side of the multiple injection tubes 5 to connect to external injection molding equipment and supply plastic material to the injection tubes 5. A cooling pipe 8 is fixedly connected to the inner wall of the fixed mold 1, circulating coolant to remove heat generated during injection molding and accelerate plastic cooling and solidification. A sliding groove 9 is formed on the right side of the outer wall of the moving mold 3. A slider 10 is slidably connected to the inner wall of the sliding groove 9. The slider 10 moves within the sliding groove 9, changing the injection area within the molding cavity 4 to achieve different stages of two-tone injection molding. Multiple insert rods 11 are slidably connected to the left side of the outer wall of block 10. The insert rods 11 play an auxiliary positioning and guiding role during the movement of slider 10, ensuring the accuracy of slider 10 movement. The outer walls of multiple insert rods 11 are provided with springs 12 to provide elastic force. When the electromagnet 13 is de-energized, it pushes the slider 10 to move, realizing the switching action of injection area. The left ends of multiple springs 12 are fixedly connected to the moving mold 3. An electromagnet 13 is fixedly connected to the left side of the inner wall of sliding groove 9. The electromagnet 13 generates or eliminates power by energizing and de-energizing. A magnetic block 14 is fixedly connected to the left side of the outer wall of the slider 10. Multiple positioning rods 15 are fixedly connected to the right side of the outer wall of the moving mold 3. Multiple positioning holes 16 are opened on the left side of the outer wall of the fixed mold 1. The multiple positioning rods 15 are slidably connected to the corresponding positioning holes 16. The positioning rods 15 cooperate with the positioning holes 16 on the fixed mold 1. When the moving mold 3 and the fixed mold 1 are closed, the positioning accuracy of the mold closing is improved, and the accuracy of product molding is guaranteed. An automatic demolding mechanism 2 is provided on the right side of the outer wall of the fixed mold 1. The automatic demolding mechanism 2 is used for automatic demolding.

[0033] Specifically, the fixed mold 1 and the moving mold 3 serve as the basic mold structure. Through the precise cooperation of the positioning rod 15 and the positioning hole 16, high-precision positioning is ensured during mold closing, providing a stable and reliable spatial structure for subsequent injection molding. The molding cavity 4 within the fixed mold 1 is the core area for product molding. After the moving mold 3 and the fixed mold 1 are closed, they jointly shape the two-tone front cover of the car's rear door. The external connecting pipe 7 introduces the plastic raw material, and the injection pipe 5 is responsible for injecting the raw material into the molding cavity 4. The flow sensor 6 on the upper injection pipe 5 monitors the flow rate in real time, ensuring accurate injection of the two colors of plastic, effectively avoiding product defects caused by uneven injection volume, and guaranteeing the stability of product quality. Cooling... Pipe 8 is embedded in the inner wall of the fixed mold 1 and works continuously during the injection molding process. It removes heat through the circulation of coolant, allowing the plastic to cool and solidify quickly and evenly. This greatly reduces the deformation of the product caused by uneven cooling and improves the dimensional accuracy and overall quality of the product. The dual-color switching mechanism, consisting of sliding groove 9, slider 10, insert rod 11, spring 12, electromagnet 13 and magnet block 14, realizes the precise switching of the injection molding area. Whether the electromagnet 13 is energized or not controls the movement of slider 10. Together with spring 12 and insert rod 11, it realizes the precise switching of the dual-color injection molding area, ensuring that the two colors of plastic are perfectly combined in the molding cavity 4, presenting a high-quality dual-color effect.

[0034] Reference Figure 1 , Figure 3 and Figure 4 The automatic demolding mechanism 2 includes multiple demolding rods 201, which are slidably connected to the upper and lower sides of the right end of the fixed mold 1. As the parts that directly contact the molded product, the demolding rods 201 apply an ejection force to the product during demolding to separate the product from the mold. The right ends of the multiple demolding rods 201 are fixedly connected to the same connecting plate 202, which connects the multiple demolding rods 201 into a whole, ensuring that all demolding rods 201 can move synchronously. The right side of the outer wall of the fixed mold 1 is fixedly connected to a fixed frame 203, which provides stable support for the entire automatic demolding mechanism 2 and ensures that the mechanism will not shift or shake during operation. The left side of the outer wall of the fixed frame 203 is fixedly connected to a push rod 204, which is a key component for transmitting demolding power. It transmits the power provided by the external power source to the connecting plate 202. The left end of the push rod 204 is fixedly connected to the connecting plate 202.

[0035] Specifically, the fixed mold 1, as a key part of the mold, provides the mounting base for the demolding mechanism. Multiple demolding rods 201 are slidably connected to the upper and lower right sides of the fixed mold 1. They directly contact the molded product and are the actuators for demolding. When the demolding process is started, the demolding rods 201 will push the product out of the mold under the corresponding power. The connecting plate 202 fixes the right ends of the multiple demolding rods 201 into a whole, ensuring that all demolding rods 201 can move synchronously, so that the product is subjected to uniform force during demolding, avoiding damage or deformation of the product due to uneven local force, and ensuring the smoothness of demolding and the integrity of the product. The fixing frame 203 is fixed to the outer wall of the fixed mold 1. On the right side, it serves to stably support the entire demolding mechanism and provides a reliable connection point for the push rod 204, ensuring the stability of the entire mechanism during demolding and preventing displacement or shaking due to force. One end of the push rod 204 is connected to the fixed frame 203, and the other end is fixed to the connecting plate 202. It is a key component for transmitting demolding power. When an external power source, such as a hydraulic or pneumatic device, drives the push rod 204 to move, the push rod 204 drives the connecting plate 202, which in turn drives multiple demolding rods 201 to move synchronously to the left, smoothly ejecting the formed car tailgate two-color mask from between the moving mold 3 and the fixed mold 1, completing the automatic demolding action, improving production efficiency, and ensuring the continuity of the production process.

[0036] Reference Figure 1 , Figure 2 and Figure 6 The top of both the fixed mold 1 and the moving mold 3 is fixedly connected to a mounting box 17. The inner walls of both mounting boxes 17 are fixedly connected to an alarm light 18. When the mold malfunctions, the alarm light 18 will light up to alert the operator. An information plate 19 is set on the left side of the outer wall of the moving mold 3 to mark mold parameters and other information. Screws 20 are threaded around the outer wall of the information plate 19. The rear ends of the outer walls of the multiple screws 20 are threaded to the moving mold 3. A cross groove 21 is opened on the left side of the outer wall of the multiple screws 20. The inner walls of the multiple cross grooves 21 are treated with anti-slip treatment to facilitate the screws 20 with a screwdriver.

[0037] Specifically, when the mold malfunctions, the alarm light 18 illuminates to alert the operator. The information plate 19 is fixed to the left side of the outer wall of the moving mold 3 by screws 20 around it. It is used to mark information such as mold parameters. The cross groove 21 is treated with anti-slip treatment to make it easy to turn the screws 20 with a screwdriver. When it is necessary to replace or adjust the information plate 19, it can be operated more stably to ensure that the information plate 19 is firmly installed.

[0038] Reference Figure 1 , Figure 2 and Figure 5Two guide plates 22 are fixedly connected to the rear side of the outer wall of the fixed mold 1. The moving mold 3 is slidably connected to the guide plates 22 to provide guidance for the movement of the moving mold 3, ensuring smooth and precise positioning during mold closing and opening. A controller 23 is fixedly connected to the front side of the outer wall of the fixed mold 1. The controller 23 is electrically connected to the flow sensor 6 and the electromagnet 13 respectively, controlling the electromagnet 13 to achieve precise control of dual-color switching. Fixed seats 24 are fixedly connected to the front and rear sides of the bottom of the fixed mold 1 and the moving mold 3. Bolts 25 are threaded at the four corners of the outer wall of the two fixed seats 24. The mold is firmly installed on the worktable by the bolts 25 to prevent the mold from shifting during operation and to ensure overall stability.

[0039] Specifically, the guide plate 22 is fixed to the rear side of the outer wall of the fixed mold 1 to provide guidance for the movement of the moving mold 3, ensuring smooth and precise positioning during mold closing and opening. The controller 23 is installed on the front side of the outer wall of the fixed mold 1 to receive the injection flow data monitored by the flow sensor 6, and controls the electromagnet 13 accordingly to achieve precise control of dual-color switching. The fixed base 24 is located at the bottom of the fixed mold 1 and the moving mold 3, and the mold is firmly installed on the worktable by bolts 25 to prevent the mold from shifting during operation and to ensure overall stability.

[0040] Working principle: The fixed mold 1 and the moving mold 3 are respectively installed on the corresponding drive devices. When injection begins, the drive device pushes the moving mold 3 towards the fixed mold 1 until the two are engaged. At this time, the positioning rod 15 on the right side of the outer wall of the moving mold 3 is precisely inserted into the corresponding positioning hole 16 on the left side of the outer wall of the fixed mold 1. This design greatly improves the positioning accuracy when the moving mold 3 and the fixed mold 1 are engaged, avoiding a series of subsequent problems caused by inaccurate engagement, and fundamentally ensuring the accuracy of product molding. Then, the electromagnet 13 is de-energized. The slider 10, which was originally constrained by the magnetic force of the electromagnet 13, is squeezed into the interior of the moving mold 3 under the elastic force of the spring 12, so that the lower part of the molding cavity 4 becomes the first injection zone. At this time, the external injection molding equipment is started, and the plastic raw material flows into the multiple injection tubes 5 at the bottom through the external connection pipe 7. During this process, the flow sensor 6 plays a crucial role. The key function is to monitor the flow rate of plastic in each injection tube 5 in real time. Once an abnormal flow rate is detected, it can provide timely feedback and adjustment to effectively prevent too much or too little plastic from being injected, ensuring the uniformity of plastic filling in the first injection zone and avoiding temperature differences and internal stress during cooling due to uneven filling. After the first part of the injection is completed, the cooling program is started. By connecting the cooling pipe 8 to an external drive circulation device, the coolant circulates in the pipe, quickly removing the heat generated during the injection process and accelerating the cooling of the plastic. When the injection molded part has a certain hardness, the electromagnet 13 is energized to generate magnetism, attracting the magnet block 14 on the slider 10 and moving the slider 10 to the left to complete the switching of the injection zone. Subsequently, the multiple injection tubes 5 on the upper side begin to inject the second color of injection molding material. After completion, cooling is performed again to make the materials of the two injections firmly bonded into a whole.

[0041] Furthermore, after the two-tone tailgate cover of the car has undergone two injection molding processes and cooling and solidification within the molding cavity 4 formed by the fixed mold 1 and the moving mold 3, the demolding process is initiated. The fixed frame 203, as the supporting structure of the entire automatic demolding mechanism, is stably connected to the right side of the outer wall of the fixed mold 1. The push rod 204 is fixed to the left side of the fixed frame 203, playing a key role in transmitting power. At this time, the push rod 204 is pushed to the left. Since the left end of the push rod 204 is fixedly connected to the connecting plate 202, the connecting plate 202 will move along with the push rod 204. The moving part moves to the left, and because the right ends of multiple demolding rods 201 are fixed on the connecting plate 202 and are slidably connected to the upper and lower sides of the right end of the fixed mold 1, the leftward movement of the connecting plate 202 will drive multiple demolding rods 201 to move to the left synchronously. The left ends of these demolding rods 201 contact the molded car tailgate two-color face mask. As the demolding rods 201 extend to the left, they will apply a uniform pushing force to the product, thereby ejecting the product from between the moving mold 3 and the fixed mold 1, completing the automatic demolding process.

[0042] Finally, it should be noted that the above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A mold for a two-tone mask for a car tailgate, comprising a fixed mold (1) and a moving mold (3), characterized in that: The fixed mold (1) has a molding cavity (4) on the left side of its inner wall. Multiple injection tubes (5) are connected to the right side of the inner wall of the molding cavity (4). Flow sensors (6) are connected to the right side of the outer walls of the multiple injection tubes (5) on the upper side. External connection pipes (7) are connected to the right side of the multiple injection tubes (5). Cooling pipes (8) are fixedly connected to the inner wall of the fixed mold (1). A sliding groove (9) is provided on the right side of the outer wall of the moving mold (3). A slider (10) is slidably connected to the inner wall of the sliding groove (9). Multiple insert rods (11) are slidably connected to the left side of the outer wall of the slider (10). Each insert rod (11) has a... A spring (12) is provided, and the left ends of the multiple springs (12) are fixedly connected to the moving mold (3). An electromagnet (13) is fixedly connected to the left side of the inner wall of the sliding groove (9). A magnet (14) is fixedly connected to the left side of the outer wall of the slider (10). Multiple positioning rods (15) are fixedly connected to the right side of the outer wall of the moving mold (3). Multiple positioning holes (16) are opened on the left side of the outer wall of the fixed mold (1). The multiple positioning rods (15) are slidably connected to the corresponding positioning holes (16). An automatic demolding mechanism (2) is provided on the right side of the outer wall of the fixed mold (1). The automatic demolding mechanism (2) is used for automatic demolding.

2. The automotive tailgate two-tone mask mold according to claim 1, characterized in that: The automatic demolding mechanism (2) includes multiple demolding rods (201), which are slidably connected to the upper and lower sides of the right end of the fixed mold (1). The right ends of the multiple demolding rods (201) are fixedly connected to the same connecting plate (202). A fixing frame (203) is fixedly connected to the right side of the outer wall of the fixed mold (1), and a push rod (204) is fixedly connected to the left side of the outer wall of the fixing frame (203). The left end of the push rod (204) is fixedly connected to the connecting plate (202).

3. The automotive tailgate two-tone mask mold according to claim 1, characterized in that: The top of both the fixed mold (1) and the moving mold (3) are fixedly connected to mounting boxes (17), and alarm lights (18) are fixedly connected to the inner walls of both mounting boxes (17).

4. The automotive tailgate two-tone mask mold according to claim 1, characterized in that: An information board (19) is provided on the left side of the outer wall of the moving mold (3). Screws (20) are threaded around the outer wall of the information board (19), and the rear ends of the outer walls of the screws (20) are threaded to the moving mold (3).

5. A two-tone mask mold for a car tailgate according to claim 4, characterized in that: Each of the screws (20) has a cross groove (21) on the left side of its outer wall, and the inner wall of each cross groove (21) is treated with anti-slip treatment.

6. The automotive tailgate two-tone mask mold according to claim 1, characterized in that: Two guide plates (22) are fixedly connected to the rear side of the outer wall of the multiple fixed molds (1), and the moving mold (3) is slidably connected to the guide plates (22).

7. A two-tone mask mold for a car tailgate according to claim 2, characterized in that: A controller (23) is fixedly connected to the front side of the outer wall of the fixed mold (1). The controller (23) is electrically connected to the flow sensor (6) and the electromagnet (13).

8. A two-tone mask mold for a car tailgate according to claim 1, characterized in that: The fixed mold (1) and the moving mold (3) are both fixedly connected to the front and rear sides of the bottom with fixed seats (24), and bolts (25) are threadedly connected to the four corners of the outer walls of the two fixed seats (24).

Images